Methodological analysis of the relationship table - Code World

Methodological analysis of the relationship table

Others 2019-12-07 23:30:50 views: null

The easiest way to determine the relationship between the table (******)
books and publishing
a book !!! Can not have multiple imprints
a publishing house published many books can! Can
one pair many relationship

    图书与作者表
        一本书可不可以有多个作者    可以!!!
        一个作者可不可以写多本书     可以!!!
        多对多的关系
    
    
    作者与作者详情
        一个作者可不可以有多个详情  不可以!!!
        一个作者详情可不可以有多个作者  不可以!!!
         要么两者是一对一
         要么两者之间没任何关系

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Origin www.cnblogs.com/dreamlyue/p/12003848.html

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